Solar Charger Not Achieving Full Output; Pv Yield Lower Than Expected - Victron energy MPPT 150/70 Manual

Battery health check using battery monitor history data
In the VictronConnect app, navigate to the battery monitor history
Step 1
screen. Or (if applicable) access the battery history via the VRM portal.
Determine the number of charge cycles and synchronisations. Both
Step 2
indicate how many charge cycles the battery underwent.
Step 2 Determine the average discharge or cumulative energy drawn.
Refer to the battery data sheet to find out how many cycles at what
average discharge the battery is capable of. Compare this with the
Step 3
battery history and determine if the battery is approaching the end of
its service life.
Check if the battery has been completely discharged at any point. Total
Step 4 and very deep discharges can damage a battery. Examine the deepest
discharge, the lowest battery voltage and the number of full discharges.
Check if the battery has been charged with a too-high voltage. A very
high charge voltage can damage the battery. Review the maximum
Step 5 battery voltage and the high voltage alarms. Verify that the measured
maximum voltage has not exceeded the battery manufacturer's
recommendations.

8.8. Solar charger not achieving full output

In addition to potential issues with the PV array, several other reasons can hinder the solar charger from reaching its full-rated
output.
Reasons for the solar charger not reaching its full output:
• The PV array is too small. If the PV array's power rating is less than the solar charger's nominal power rating, the solar charger
cannot output more power than the connected solar array can provide.
• The PV array is not reaching its maximum power rating. Refer to the
• The PV array is a mix of different PV panel types or models. Only use solar panels that are of the same brand, type and model.
• Do not use optimisers. Nearly all optimisers contain an MPPT or other tracking mechanisms, which will interfere with the MPPT
algorithm in the solar charger.
• The PV array is wrongly configured. For a detailed explanation of how to configure PV arrays and properly use MC4 splitters
and MC4 combiners, see the "Solar panel" chapter in the
• The solar charger's maximum PV output power is related to the battery voltage. Refer to the
battery voltage [59] subchapter.
• The solar charger's PV electric connections are burned or melted, or MC4 connectors have been insufficiently crimped. Refer to
the PV connections burned or melted [60]
• The solar charger temperature is above 40°C. Refer to the
• The batteries are either full or nearly full, causing no further power to flow into them.
• There may be an issue with the battery. Refer to the
chapters.

8.8.1. PV yield lower than expected

If the PV yield is not meeting expectations, start by checking the solar charger history in the VictronConnect app. Verify the total
maximum power (Pmax) for each day and compare it with the array power.
To determine the potential solar yield per day for a specific PV array size in a particular geographical location, utilise the MPPT
sizing calculator on the solar charger product
List of reasons why the PV array may generate less power than expected:
• Low sun angle (morning or evening) or seasonal differences.
• Cloud cover or adverse weather conditions.
• Shading from trees or buildings.
Page 58
MPPT solar charger manual
PV yield lower than expected [58]
Wiring Unlimited
subchapter.
Temperature above 40°C [60]
Batteries are not charged [50]
page.
VictronConnect app showing
battery monitor history
subchapter.
Book.
Maximum output power relates to
subchapter.
and Batteries are undercharged [54]
Troubleshooting